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Fair value of financial assets and liabilities (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Statement [Line Items]    
Trade Receivables ¥ 16,678 ¥ 12,568
Convertible notes payable 5,393 12,922
Trade Payable 2,422 1,302
Other payable 22,424 22,780
Carrying amount [member]    
Statement [Line Items]    
Cash, Cash Equivalents And Restricted Cash 3,339 79
Trade Receivables 16,678 12,568
Total Financial Assets 20,017 12,647
Convertible notes payable 5,393 12,922
Trade Payable 22,424 1,302
Salary and benefit payable 4,262 3,764
Other payable 2,422 387
Total Financial Liabilities 34,501 18,375
Fair value [Member]    
Statement [Line Items]    
Cash, Cash Equivalents And Restricted Cash 3,339 79
Trade Receivables 16,678 12,568
Total Financial Assets 20,017 12,647
Convertible notes payable 5,393 12,922
Trade Payable 2,422 1,302
Salary and benefit payable 4,262 3,764
Other payable 22,424 387
Total Financial Liabilities ¥ 34,501 ¥ 18,375